18685020019 has 2 divisors, whose sum is σ = 18685020020. Its totient is φ = 18685020018.

The previous prime is 18685020001. The next prime is 18685020023. The reversal of 18685020019 is 91002058681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18685020019 - 2⁷ = 18685019891 is a prime.

It is a super-2 number, since 2×18685020019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18685020089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342510009 + 9342510010.

It is an arithmetic number, because the mean of its divisors is an integer number (9342510010).

Almost surely, 2^18685020019 is an apocalyptic number.

18685020019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685020019 is an equidigital number, since it uses as much as digits as its factorization.

18685020019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 18685020019 in words is "eighteen billion, six hundred eighty-five million, twenty thousand, nineteen".